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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="PCModifySubMatrices"><H1>PCModifySubMatrices</H1></A>
Calls an optional user-defined routine within certain preconditioners if one has been set with PCSetModifySubMarices().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PCModifySubMatrices(PC pc,PetscInt nsub,const IS row[],const IS col[],Mat submat[],void *ctx)
</PRE>
Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nsub </B></TD><TD>- the number of local submatrices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>row </B></TD><TD>- an array of index sets that contain the global row numbers
that comprise each local submatrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>col </B></TD><TD>- an array of index sets that contain the global column numbers
that comprise each local submatrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>submat </B></TD><TD>- array of local submatrices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- optional user-defined context for private data for the
user-defined routine (may be null)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>submat </B> -array of local submatrices (the entries of which may
have been modified)
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The user should NOT generally call this routine, as it will
automatically be called within certain preconditioners (currently
block Jacobi, additive Schwarz) if set.
<P>
The basic submatrices are extracted from the preconditioner matrix
as usual; the user can then alter these (for example, to set different
boundary conditions for each submatrix) before they are used for the
local solves.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, modify, submatrices
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCSetModifySubMatrices.html#PCSetModifySubMatrices">PCSetModifySubMatrices</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/interface/precon.c.html#PCModifySubMatrices">src/ksp/pc/interface/precon.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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